[PATCH] [x86] Fold extract_vector_elt of a load into the load's address computation.

[Michael Spencer]

Moved to DAGCombiner and refactored the existing load slicing code.

http://reviews.llvm.org/D3375

Files:
  lib/CodeGen/SelectionDAG/DAGCombiner.cpp
  test/CodeGen/X86/vec_splat.ll
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